Extrusion Mold for Non-Pneumatic Multi-Hole Hollow Tyre

ABSTRACT

The invention discloses an extrusion mold for non-pneumatic multi-hole hollow tyres, which can be used for producing the hollow tyres which are non-pneumatic, highly elastic and materials-saving and is characterized by consisting of the mold frame ( 1 ) and the mold core ( 2 ), with one end of the mold frame ( 1 ) connected with the extruder&#39;s feeder and the other end connected with the mold core ( 2 ); inside the mold frame ( 1 ) is provided a feeding via ( 3 ), one end of which communicates with the feed inlet of the extruder&#39;s feeder and the other end communicates with the discharge hole ( 4 ) of the mold core ( 2 ) ; the discharge hole ( 4 ) is provided with several mold blocks ( 5 ), which match the shape of the hollow holes in the tyres and are directly or indirectly connected with the wall of the discharge hole ( 4 ) through a thin-wall connection strap ( 6 ).

FIELD OF THE INVENTION

The invention relates to a rubber extrusion mold, particularly an extrusion mold for non-pneumatic multi-hole hollow tyres.

BACKGROUND OF THE INVENTION

Currently, there are mainly three types of tyres. One type of the tyres includes the inner tube, which is charged, and the cover tyre. This kind of structure is the most common but the shortcoming is that usually the inner tube can no longer be used once pricked in use and that they have to be manufactured through two different processes. The second type of tyre is single-hole tyre without inner tube, such as the tyres without inner tube used for cars. This type of tyre also needs charging before use and has to be replaced or repaired once pricked. Besides, the installation is so complicated that special tools are needed. And these tyres have higher requirements of the wheel hubs. The third of tyres is solid. Although they are not vulnerable to pricking, they are not elastic in use and need many materials. Therefore, it is a pressing task to produce a kind of non-pneumatic multi-hole hollow tyres which can save materials and are elastic and not vulnerable to pricking. What matters is that appropriate rubber extrusion mold is not available.

SUMMARY OF THE INVENTION

The invention aims to provide an extrusion mold for non-pneumatic multi-hole hollow tyres, which can be used for producing non-pneumatic, highly elastic and materials-saving tyres.

The technological plan of the invention is as follows:

An extrusion mold for non-pneumatic multi-hole hollow tyres, characterized by consisting of a mold frame 1 and a mold core 2, with one end of the mold frame 1 connected with the feeder of extruder and the other end connected with mold core 2; inside the mold frame 1 is provided a feeding via 3, one end of which communicates with the feed inlet of the extruder's feeder and the other end of which communicates with the discharge hole 4 in the mold core 2; the discharge hole 4 is provided with several mold blocks 5, which match the shape of the hollow holes in tyres and are directly or indirectly connected with the wall of the discharge hole 4 through a thin-wall connection strap.

The invention has also taken the following technological measures:

The side on which the mold core 2 is connected with the mold frame 1 is provided with a boss 201, which inserts into the feeding via 3 of the mold frame 1.

The number of the said mold blocks 5 matching the shape of the hollow holes in tyres is not less than 2.

H, the length of the discharge hole 4 shall not be less than 10 mm so that the rubber can be efficiently molded when extruded.

The beneficial effects of the invention are as follows:

1. Appropriate producing molds are provided for the production of the non-pneumatic multi-hole hollow tyres, which is favorable for the popularization and mass production of that kind of tyres.

2. The structure is simpler and the manufacture is easy. The parts of the extrusion mold are reduced to the greatest extent by increasing the mold blocks, the shape of which is the same as that of the holes molded finally, in the extrusion hole. This is unmatched by the molds of the same kind and completely solves the problem of the difficult location of the mold core of the current extrusion molds.

3. The tyres produced according to the invention are characterized in that they are non-pneumatic, safe, reliable and not vulnerable to pricking.

4. Tyres bursting accidents on freeways, which serious jeopardize driving safety, will not happen.

5. With many uses, it can be used for the production of different kinds of tyres. Tyres of many different kinds can be produced by varying the number and shape of the mold blocks.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is the structural schematic view of the invention.

FIG. 2 is the top structural schematic view of FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION

The invention will be further described in conjunction with the drawings and embodiments.

Embodiment 1, as shown in FIG. 1 and FIG. 2:

An extrusion mold for non-pneumatic multi-hole hollow tyres, only consisting of two parts, mold frame 1 and mold core 2; with the inside of the mold frame 1 provided with a feeding via 3 and the mold core 2 provided with a discharge hole 4 which forms hollow hole needed after the rubber passes through; for the purpose of ensuring the molding effects, the height of the discharge hole shall not be less than 10 mm, with one end of the mold frame 1 connected with the extruder's feeder and the other end connected with the mold core 2; the side on which the mold core 2 is connected with the mold frame 1 is provided with a boss 201 (The boss 201 can also be left out in the specific implementation of the invention, i.e., the side on which the mold core 2 is connected with the mold frame 1 is flat), which inserts into the feeding via 3 located inside the mold frame 1, with one end of the feeding via 3 communicating with the feed inlet of the extruder's feeder and the other end communicating with the discharge hole 4 in the mold core 2; inside the discharge hole 4 are located several mold blocks 5 (There are more than two mold blocks and there are five mold blocks in this embodiment, as shown in FIG. 2), which match the shape of the hollow holes in tyres and can either be directly connected with the wall of the discharge hole 4 through a thin-wall connection strap 6 or indirectly connected with the wall of the discharge hole 4 after being interconnected.

Several lightening holes 7 may be made in the mold frame 1 so as to reduce its weight.

The thin-wall connection strap 6 shall be as thin as possible, preferably less than 1˜2 mm, so that its thin-strip vias formed in tyres during the process of extrusion molding will automatically disappear during the cooling process after the removal of the rubber out of the mold. 

1. An extrusion mold for non-pneumatic multi-hole hollow tyres comprising: a mold core (2); a mold frame (1) with one end for connecting with an extruder's feeder and other end for connecting with the mold core (2); inside the mold frame (1) being provided a feeding via (3), one end of which communicates with a feed inlet of the extruder's feeder and other end communicates with a discharge hole (4) in the mold core (2); the discharge hole (4)being provided with several mold blocks (5), which match the shape of the hollow holes in tyres and are directly or indirectly connected with the wall of the discharge hole (4) through a thin-wall connection strap (6).
 2. The extrusion mold for non-pneumatic multi-hole hollow tyres according to claim 1, wherein the side of the mold core on which the mold core (2) is connected with the mold frame (1) is provided with a boss (201), which inserts into the feeding via (3) of the mold frame (1).
 3. The extrusion mold for non-pneumatic multi-hole hollow tyres according to claim 1, wherein the number of the said mold blocks (5) matching the shape of the hollow holes in the tyres is not less than
 2. 4. The extrusion mold for non-pneumatic multi-hole hollow tyres according to claim 1, wherein H, the length of the said discharge hole (4) is not less than 10 mm. 